Question

A train starts from rest to attain 20m/s in 5s. Calculate the acceleration of the train??

Answer 1

Explanation:

hey dear

here is yuour answer

initial velocity = 0

final velocity = 20 m/s

time = 5 seconds

acceleration = ?

so, by using 1st equation of motion

v = u+at

20 = 0+5a

a = 20/5= 4m/s²

hope it helps :)

Please mark it as brainliest

Answer 2

Given:

• A train starts from rest i.e. it had an initial velocity of 0m/s.
• It attains a velocity of 20m/s .
• The time taken to achieve that velocity is 5 seconds .

To Find:

• The acceleration of the train .

Answer:

Initial velocity = 0m/s (u).

Final velocity = 20m/s (v) .

Time taken = 5 seconds (t).

Now , acceleration is defined as the rate of change of velocity .

$\large{\underline{\boxed{\red{\bf{\leadsto accel^{n}=\dfrac{v-u}{t}=\dfrac{\Delta v}{\Delta t}}}}}}$

$\sf{\implies accel^{n}= \dfrac{20m s^{-1}-0m s^{-1}}{5}}$

$\sf{\implies accel^{n}=\dfrac{20m s^{-1}}{5 s}}$

$\boxed{\bf{\leadsto accel^{n}=4 ms^{-2}}}$

Hence the acceleration of the object was 4m/s².